Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a06febb7ba5527…

MALICIOUS

PDF

55.5 KB Created: 2020-09-01 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30a74776f5b229de1124d88cd8921b3d SHA-1: 95ca331eca1f36b5c3643530a2301062144a9a11 SHA-256: e9a06febb7ba55276cb0dd34a098b663ead77b2daaa78b01a542ed9eecc37776
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.me/wix?keyword=english+speaking+topics+for+ielts+with+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other PDF links, many pointing to benign Shopify or static.usrfiles.com domains, indicates a potential link farm or SEO poisoning tactic to mask the malicious redirector. No scripts were extracted, limiting the analysis of further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=english+speaking+topics+for+ielts+with+answers
    • https://cdn.shopify.com/s/files/1/0430/8605/3527/files/biroguxipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/54627252713.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/banking_awareness_quiz_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/kinds_of_adjectives_worksheets_with_answers.pdf
    • https://static.usrfiles.com/ugd/23b571_bedfc08faa5a4d29a7c8a0602f9a0c33.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_28861583dd1c4bf19f35810011406b2a.pdf
    • https://static.usrfiles.com/ugd/0f1814_c7ed0e807754442492fce361cd90e74f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6f00a6cd5614ec38969c5c3727e4018.pdf
    • https://static.usrfiles.com/ugd/4c76bf_45760e26848243cdb199d466eb1f8f58.pdf
    • https://static.usrfiles.com/ugd/1849a1_439de5cf13d8417d9dc32c1a9c59aa4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef38ea2aa5194f5885878dbb1522c6d5.pdf
    • https://static.usrfiles.com/ugd/87a178_5ad53d50a3294877a6721f7321fa08f9.pdf
    • https://static.usrfiles.com/ugd/5b5da7_3b8cd50916f54fb7ad3500802b94d487.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5bbd38f8a344c6dacc8e5c22a265919.pdf
    • https://static.usrfiles.com/ugd/23e9be_939bead3743447d18f06afcffd5eff50.pdf
    • https://static.usrfiles.com/ugd/95ea6b_1b91ad68862c4822b04e13a59ded5762.pdf
    • https://static.usrfiles.com/ugd/8b2c09_3950ef36d8f5458e8175b0148e0f99b2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ae8.bin
45a80317050aa94ae924ddfb0bcc5435ccc821951736cf3ced00e1624b488e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE8 5388 bytes
font_01_sfnt_off0000ad56.bin
ab63f4fe89794940ecd4e0ad02043a32d429b651f71bbff304fc5dc6e6183494		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD56 10456 bytes

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